Update content/hardware/05.pro-solutions/solutions-and-kits/opta/tutorials/getting-started-with-rs485/content.md

Co-authored-by: Julián Caro Linares <[email protected]>

Author: BenjaminDannegard

content/hardware/05.pro-solutions/solutions-and-kits/opta/tutorials/getting-started-with-rs485/content.md

@@ -60,7 +60,7 @@ Connect the sender and receiver Opta according to the image shown below.
 
 ![Connecting RS485 on Opta](assets/opta-modbus-connection.png)
 
-### RS485 Sender Sketch
+### Modbus RTU RS485 Sender Sketch
 
 Now upload this sketch to the device you want to designate as the sender device.